sink something into something

Từ điển Oxford Advanced Learner 8th

▪ I. ˌsink sth ˈinto sth derived
to spend a lot of money on a business or an activity, for example in order to make money from it in the future
•We sank all our savings into the venture.
Main entry: ↑sink_derived
 
▪ II. ˌsink ˈinto sth | ˌsink sth ˈinto sth derived
to go, or to make sth sharp go, deep into sth solid
•The dog sank its teeth into my leg (= bit it).
•I felt her nails sink into my wrist.
Main entry: ↑sink_derived